Over 20 years ago I managed to get my hands on what was at the time one of the new for the time budget air rifles, the Crosman 1077. This air rifle is a CO2 powered semi auto air rifle that somewhat models a Ruger 10/22 or similar semi auto .22 rifle. This gun claims to shoot at 625 fps, which for a CO2 semi auto gun was rather impressive. At the time I was in love with this gun because of its performance potential. Of course now there are air guns out there that would put this gun in the same class as a Daisy Red Ryder. With the world of large bore air rifles, large bore semi and even full auto air rifles, this gun is far from being a performance shooter. Needless to say, this 20+ year old veteran deserved to be resurrected.
With an aftermarket valve kit in hand, I was ready to get this gun back online. The kit comes with a new power valve and gasket for the CO2 base valve or whatever that part is called. I had to break the gun down, removing the action from the stock and pulling the receiver apart into the two pieces to be able to remove the power valve and CO2 base/valve. The first thing I repaired was the CO2 valve. To do this I unscrewed a retaining ring and scraped out the remains of the plastic/wax seal that surrounds the CO2 piercing nipple. I replaced the seal and reassembled the unit, then placed the piece back in the CO2 cartridge tube. The CO2 valve used a roll pin to secure the unit in the tube. Once this was done, I was able to reassemble the rest of the internals. The power valve was seated with the gas tube into the CO2 valve and the trigger group installed back in place. After reassembling the barrel and receiver cap, I was able to put the whole works back into the stock to get the gun reassembled. With the gun back together, I'll have to test this thing to confirm all is good. I just received a chronograph which will play a pivotal role in future gun tests, so I'll be using this tool to test the performance of this air rifle after replacing the valve components. I did save the old power valve, which for all intents was still good, just the CO2 valve seal was bad. With that, I plan on doing some experiments with modifying the power valve in order to squeeze some more power from the gun. From what I've seen in similar modifications, the power valve was disassembled, and the spring inside switched with a lighter spring so the valve would be opened more when the hammer strikes home. Of course, adding a stronger hammer spring will help in opening the valve more just as well. If I can manage to make these changes, maybe I can turn this regular backyard plinking gun to something capable of taking small game.
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